Observation of thermally excited charge transport modes in a superconducting single-electron transistorA. J. Manninen, Yu. A. Pashkin, A. N. Korotkov and J. P. PekolaEurophys. Lett., 39 3 (1997) 305-310DOI: https://doi.org/10.1209/epl/i1997-00352-3